Coffee machine



FIG. 1 is a top, front, and left side perspective view of a coffee machine showing my new design.

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front perspective view thereof; and

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a coffee machine, as shown. 